Oral controlled release formulations

Abstract

Pharmaceutical composition capable of releasing a therapeutically effective dose of active agent, e.g., rivastigmine, in a time-controlled manner.

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       8 . A two-pulse release pharmaceutical composition 
 comprising: 1) a first component comprising a therapeutically effective amount of rivastigmine wherein 70 to 95% of said rivastigmine is released in water within 3 to 4 hours; and 2) a second component comprising a core containing a therapeutically effective amount of rivastigmine and a coating wherein the coating comprises an outer film and an inner film, the inner film being in the form of a membrane which is semi-permeable to water or body fluids, and wherein rivastigmine is released 6 to 12 hours after ingestion.    
   
   
       9 . A pharmaceutical composition according to  claim 8  wherein said outer film is permeable to water or body fluids.  
   
   
       10 . A pharmaceutical composition according to  claim 8  wherein said coating has a thickness of 50 to 800 micrometers.  
   
   
       11 . A pharmaceutical composition according to  claim 8  wherein said core releases an effective dose of said rivastigmine 6 to 12 hours after ingestion  
   
   
       12 . Pharmaceutical composition comprising a core containing rivastigmine as a pharmaceutically active agent and coating comprising an inner film and an outer film, wherein the inner film comprises cellulose acetate and is permeable to water and body fluids and hinders egress of the dissolved rivastigmine out of the core, and the outer film comprises ethylcellulose and is permeable to water and body fluids.  
   
   
       13 . Pharmaceutical composition according to  claim 12 , wherein the coating has a thickness of 50 to 800 micrometers.